Method of making floor mats

摘要

Methods of making thermoplastic articles having integral projections extending from a surface thereof. The methods utilize a mold plate having a top side, an underside and a cavity extending from the top side to the underside for forming the integral projection. The methods utilize an air escape passage for allowing escape of air from the cavity in the mold plate during the pressing operation. At least a portion of the molding operation is conducted while the temperature of the entrance to the air escape passage is below the molding temperature of the thermoplastic material being molded.